package com.heima.media.interceptor;


import com.heima.common.dto.User;
import com.heima.common.util.MediaThreadLocalUtil;
import org.springframework.util.StringUtils;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class UserInterceptor implements HandlerInterceptor {
    /**
     * 前置拦截
     * @param request
     * @param response
     * @param handler
     * @return
     * @throws Exception
     */
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        // 或的请求头中对的userId
        String userId = request.getHeader("userId");
        // 如果不为空, 将 userId 存放到本地线程中
        if (!StringUtils.isEmpty(userId)){
            User user = new User();
            user.setUserId(Integer.parseInt(userId));
            MediaThreadLocalUtil.set(user);
        }
        //放行
        return true;
    }

    /**
     * 后置拦截
     * @param request
     * @param response
     * @param handler
     * @param modelAndView
     * @throws Exception
     */
    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        // 释放资源
        MediaThreadLocalUtil.remove();
    }
}
